Passenger　volume　of　lasting　large　scale　activities　have　the　features　of　gathering,　dispersing　and　large　scale　within　a　short　time　and　a　small　range.　Lasting　large　scale　activities　are　defined　as　the　large　activities　or　events　held　for　days,　they　have　long　duration,　wide　range　of　influence,　and　obvious　passenger　volume　fluctuation,　the　passenger　volume　scale　and　time-space　distribution　is　affected　by　weather,　environment,　holiday　trip　mode　and　other　factors.　It　is　important　to　reveal　influencing　factors　and　the　influencing　mechanism　for　the　transportation　operation　and　organize　for　lasting　large　scale　activities.　This　study　based　on　the　passenger　volume　of　the　9th　China　International　Garden　Expo,　collected　vehicle　load　coefficient　through　field　car-following　investigation.　After　observing　the　passenger　volume　by　automated　method,　the　study　gained　passenger　volume　data　in　a　period　of　four　months.　Based　on　the　collected　data,　the　paper　analyzes　the　characteristics　of　trip　mode　and　passenger　arrival　and　departure,　as　well　as　the　influencing　factors　of　passenger　volume　scale.　This　analysis　shows　that　visit　cost,　weather　and　holidays　are　the　main　factors　which　are　influencing　the　passenger　volume　scale.　People　tend　to　take　care　about　their　cost　during　visit　and　prefer　to　travel　in　good　weather　or　holiday.　Compared　with　the　working　day,　weekend　and　holiday　passenger　volume　highest　average　growth　is　over　200%,　passenger　volume　growth　is　30%　on　average.　However,　on　rainy　days,　high　temperature　and　other　abnormal　weather　conditions,　the　passenger　volume　will　decrease　20%-50%.　The　self-promotion　activities　held　has　not　been　obvious　influenced　on　the　passenger　flow.　The　analysis　of　the　influencing　factors　and　time-space　distribution　characteristics　of　passenger　volume　of　lasting　large　scale　activities,　will　contribute　to　the　study　of　traffic　impact　model　of　special　activities,　and　provide　effective　data　to　support　to　make　valid　traffic　organization　and　management　measures　during　lasting　large　scale　activities.